[glade] GladeWindow: add CSS optimization for Quartz backend

[Juan Pablo Ugarte <jpu src gnome org>]

commit 7c17877ed3ad0683fda6c59e6cbe9b42b653178e
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Wed Jul 8 19:38:51 2020 -0300

    GladeWindow: add CSS optimization for Quartz backend
    
    Disable shadows and animations on OSX to improve performance.
    Add glade_window_get_gdk_backend()

 src/glade-window.c   | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/glade-window.css | 18 +++++++++++++++
 src/glade-window.h   | 16 +++++++------
 3 files changed, 92 insertions(+), 7 deletions(-)
---
diff --git a/src/glade-window.c b/src/glade-window.c
index 888dd40e..b12ad494 100644
--- a/src/glade-window.c
+++ b/src/glade-window.c
@@ -2101,6 +2101,7 @@ static void
 glade_window_init (GladeWindow *window)
 {
   GladeWindowPrivate *priv;
+  GtkStyleContext *ctx;
 
   window->priv = priv = glade_window_get_instance_private (window);
 
@@ -2119,6 +2120,10 @@ glade_window_init (GladeWindow *window)
   gtk_box_set_homogeneous (GTK_BOX (priv->save_button_box), FALSE);
 
   priv->registration = glade_registration_new ();
+
+  /* Add Gdk backend as a class */
+  ctx = gtk_widget_get_style_context (GTK_WIDGET (window));
+  gtk_style_context_add_class (ctx, glade_window_get_gdk_backend ());
 }
 
 static void
@@ -2555,3 +2560,63 @@ glade_window_registration_notify_user (GladeWindow *window)
                               /* translators: Text to show in the statusbar if the user did not completed 
the survey and choose not to show the notification dialog again */
                               _("Go to Help -> Registration & User Survey and complete our survey!"));
 }
+
+#ifdef GDK_WINDOWING_X11
+#include "gdk/gdkx.h"
+#endif
+
+#ifdef GDK_WINDOWING_QUARTZ
+#include "gdk/gdkquartz.h"
+#endif
+
+#ifdef GDK_WINDOWING_WIN32
+#include "gdk/gdkwin32.h"
+#endif
+
+#ifdef GDK_WINDOWING_WAYLAND
+#include "gdk/gdkwayland.h"
+#endif
+
+#ifdef GDK_WINDOWING_BROADWAY
+#include "gdk/gdkbroadway.h"
+#endif
+
+const gchar *
+glade_window_get_gdk_backend ()
+{
+  GdkDisplay *display = gdk_display_get_default ();
+
+#ifdef GDK_WINDOWING_X11
+  if (GDK_IS_X11_DISPLAY (display))
+    return "X11";
+  else
+#endif
+
+#ifdef GDK_WINDOWING_QUARTZ
+  if (GDK_IS_QUARTZ_DISPLAY (display))
+    return "Quartz";
+  else
+#endif
+
+#ifdef GDK_WINDOWING_WIN32
+  if (GDK_IS_WIN32_DISPLAY (display))
+    return "Win32";
+  else
+#endif
+
+#ifdef GDK_WINDOWING_WAYLAND
+  if (GDK_IS_WAYLAND_DISPLAY (display))
+    return "Wayland";
+  else
+#endif
+
+#ifdef GDK_WINDOWING_BROADWAY
+  if (GDK_IS_BROADWAY_DISPLAY (display))
+    return "Broadway";
+  else
+#endif
+  {
+    return "Unknown";
+  }
+}
+
diff --git a/src/glade-window.css b/src/glade-window.css
index b1277d06..4c4f257b 100644
--- a/src/glade-window.css
+++ b/src/glade-window.css
@@ -110,3 +110,21 @@ stackswitcher.glade-intro-highlight > button,
   animation: widget-highlight 1s infinite alternate;
 }
 
+/* Quartz workarounds to improve performance (issue #442) */
+
+/* Disable window shadow */
+GladeWindow.Quartz > decoration {
+  box-shadow: none;
+}
+
+/* Disable Glade logo shadow animation */
+GladeWindow.Quartz #glade-brand-image {
+  animation: none;
+}
+
+/* Add window border since there is no shadow */
+GladeWindow.Quartz {
+  border: 1px solid lightgray;
+  border-top: unset;
+}
+
diff --git a/src/glade-window.h b/src/glade-window.h
index 757ecff4..03a8022b 100644
--- a/src/glade-window.h
+++ b/src/glade-window.h
@@ -47,18 +47,20 @@ struct _GladeWindowClass
   GtkWindowClass parent_class;
 };
 
-GType       glade_window_get_type      (void) G_GNUC_CONST;
+GType        glade_window_get_type      (void) G_GNUC_CONST;
 
-GtkWidget  *glade_window_new           (void);
+GtkWidget   *glade_window_new           (void);
 
-void        glade_window_new_project   (GladeWindow *window);
+void         glade_window_new_project   (GladeWindow *window);
 
-gboolean    glade_window_open_project  (GladeWindow *window,
-                                        const gchar *path);
+gboolean     glade_window_open_project  (GladeWindow *window,
+                                         const gchar *path);
 
-void        glade_window_check_devhelp (GladeWindow *window);
+void         glade_window_check_devhelp (GladeWindow *window);
 
-void        glade_window_registration_notify_user (GladeWindow *window);
+void         glade_window_registration_notify_user (GladeWindow *window);
+
+const gchar *glade_window_get_gdk_backend (void);
 
 G_END_DECLS